Uhlans were a type of light cavalry, primarily armed with a lance. They first appeared in the cavalry of the Polish-Lithuanian Commonwealth, in the early 18th century. Uhlans were quickly adopted by the mounted forces of other countries, including France, Russia, Prussia, Saxony, and Austria-Hungary. The term "lancer" was often used interchangeably with "uhlan"; the lancer regiments later formed for the British Army were directly inspired by the uhlans of other armies.

A lance is a long thrusting spear designed to be used by a mounted warrior or cavalry soldier (lancer). In ancient and medieval warfare, it evolved into the leading weapon in cavalry charges, and was unsuited for throwing or for repeated thrusting, unlike similar weapons of the javelin and pike family typically used by infantry. Lances were often equipped with a vamplate, a small circular plate to prevent the hand sliding up the shaft upon impact, and beginning in the late 14th century, they were used in conjunction with a lance rest attached to the breastplate. Though best known as a military and sporting weapon carried by European knights and men-at-arms, the use of lances was widespread throughout East Asia, the Middle East, and North Africa wherever suitable mounts were available. Lancers of the medieval period also carried secondary weapons such as swords, battle axes, war hammers, maces, and daggers for use in hand-to-hand combat, since the lance was often a one-use-per-engagement weapon; assuming the lance survived the initial impact without breaking, it was often too long, heavy, and slow to be effective against opponents in a melee.